Wireless-telegraph receiving system



Aug. 19, 1930.

, c. s. FRANKLIN AL 1,773,354

/ WIRELESS TELEGRAPH RECEIVING svs'rnu Filed March 20, 1923 q em/oao/wmlfrfe RECEIVER.

BEL-Z //V/ nae/AL EECEIVEE men 601' CHARLES S..FRM\KL\N mm BERTRAM J- wn'T Patented Aug. 19, 1930 eras arearoFFicE CHARLES SAMUEL FRANKLIN AND BERTRAM J OHN WITT, OF LONDON, ENGLAND, AS-

SIGNOR T0 RADIO CORPORATION OF AMERICA, A GORZPORATION OF DELAWARE WIRELESS-TELEGRAPH RECEIVING SYSTEM Application filed March 20, 1923, Serial No. 626,423, and in Great Britain March 23, 1922.

It is known that when a radiogoniometer is connected to two frame aerials as in the Bellini aerial, the direction of signals can be found by rotating the moving coil which is connected to a suitable receiver.

According to our invention we connect to a commonpair of frame aerials two or more radiogoniometers, the moving coils .of which we connect to separate receivers. We have found that adjusting one radiogoniometer does not affect the setting on the other or others even though the receivers may be receiving the same wave lengths. Thus two or more stations which are in different directions with respect to the receiving station may bev received independently on a common aerial irrespective of what their wave lengths may be.

A better understanding of the invention will be had from the specification when read in connection with'the accompanying drawing in which the single figure illustrates the invention.

In the figure is shown two loop aerials of the Bellini type. Each of these aerials' 1 and 2 are connected to a pair of radiogoniometers indicated diagrammatically at 8 and 4. A receiver 5 isconnected as pointed out above and indicated in the drawings to the moving coil of radiogoniometer 3 while a receiver 6 is connected to the moving coil of radiogoniometer 4. In this manner two or more stations may be received independently on a common aerial.

The Bellini aerial may be combined with a plain aerial so as to produce the well known cardioid diagram; the moving coil of each radiogoniometer is then connected in a circuit coupled to the plain aerial.

Each radiogoniometer then provides a cardioid polar diagram which can be independently adjusted for each receiver without affecting the others.

The radiogoniometers may be located at the aerial or placed at a remote distance and connected to the aerial by lines or cables.

Having described our invention, what we claim is:

1. In a wireless receiving system, the combination with a pair of frame aerials of two or more radiogoniometers connected to said aerials and a receiving clrcuit coupled to each radiogoniometer, substantially as described.

.2.' The combination of two coaxial directional antenna circuits, two radio frequency signaling circuits each associated with both of said antenna circuits and inductive means for coupling said signaling circuits to said antenna circuits to permit independent signaling in each signaling circuit.

3. The combination of two loop aerial circuits, a plurality of radiogoniometers each connected to each loop aerial circuit and a separate signalling circuit connected to each radiogoniometer.

4. The combination of two loop antenna circuits, a plurality of signalling circuits and a plurality of radiogoniometers coupling each of said signalling circuits to both of said antenna circuits to permit independent signalling simultaneously in each of said signalling circuits.

5. In an aerial system the combination of a pair of loop aerials, a conducting circuit connected to each-aerial, a plurality of radiogoniometers connected to each conducting circuit, and a receiver connected to each radiogonlometer.

6. The combination of two loop aerial circuits, a plurality of radiogoniometers each connected to each loop aerial circuit and a separate signaling circuit connected to each radiogoniometer.

7 The combination of two directional an-' tenna circuits, two radio frequency signaling circuits each associated with both of said antenna circuits and means for connecting said signaling circuits to said antenna circuits to permit independent signaling in each signaling circuit.

8. The combination of two directional radio frequency receiving circuits, signaling circuits associated therewith and means for connecting each of said signaling circuits to both of said receiving circuits whereby in dependent signals may be received in each signalling circuit simultaneously from different directions.

' 9. The combination of two loop antenna circuits, a plurality of signaling circuits and a plurality of radiogoniometers coupling each of said signaling circuits to both of said antenna circuits to permit independent signaling simultaneously in each of said signaling circuits.

CHARLES SAMUEL FRANKLIN.

BERTRAM JOHN WITT. 

